underground vs secret

secret vs underground

underground and secret both are nouns.

underground and secret both are adjectives.

underground is an adverb but secret is not an adverb.

Word	Noun	Adjective	Verb	Adverb
underground	Yes	Yes	No	Yes
secret	Yes	Yes	No	No

As adjectives, underground and secret are synonyms defined as:

underground and secret: conducted with or marked by hidden aims or methods

Other synonyms of underground include clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, surreptitious, undercover.

underground (noun)	secret (noun)
an electric railway operating below the surface of the ground (usually in a city)	something that baffles understanding and cannot be explained
a secret group organized to overthrow a government or occupation force	something that should remain hidden from others (especially information that is not to be passed on)
	information known only to a special group

underground (adjective)	secret (adjective)
conducted with or marked by hidden aims or methods	the next to highest level of official classification for documents
under the level of the ground	not open or public; kept private or not revealed
	having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding
	not expressed
	(of information) given in confidence or in secret
	not openly made known
	conducted with or marked by hidden aims or methods
	designed to elude detection
	indulging only covertly
	hidden from general view or use
	communicated covertly

underground (adverb)	secret (adverb)
beneath the surface of the earth
in or into hiding or secret operation

Difference between underground and secret

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